The "realmode" entry was amongst "misc" and seems intended to be amongst
"link" instead.

Reference: /n/sources/patch/applied/realmode
Date: Wed Nov 16 20:56:21 CET 2005

--- /sys/src/9/pc/pcdisk	Wed Nov 16 20:55:36 2005
+++ /sys/src/9/pc/pcdisk	Wed Nov 16 20:55:24 2005
@@ -35,6 +35,7 @@
 link
 	devpccard
 	devi82365
+	realmode
 	apm		apmjump
 	ether2000	ether8390
 	ether2114x	pci
@@ -60,7 +61,6 @@
 	usbuhci
 
 misc
-	realmode
 	archmp		mp apic
 
 	sdata		pci sdscsi